diff --git a/support/tools/TableGen/InstrSelectorEmitter.h b/support/tools/TableGen/InstrSelectorEmitter.h
index 16ac6bfccf6..922aa79dfa1 100644
--- a/support/tools/TableGen/InstrSelectorEmitter.h
+++ b/support/tools/TableGen/InstrSelectorEmitter.h
@@ -12,6 +12,8 @@
 #include "CodeGenWrappers.h"
 #include <vector>
 #include <map>
+#include <cassert>
+
 class DagInit;
 class Init;
 class InstrSelectorEmitter;
diff --git a/utils/TableGen/InstrSelectorEmitter.h b/utils/TableGen/InstrSelectorEmitter.h
index 16ac6bfccf6..922aa79dfa1 100644
--- a/utils/TableGen/InstrSelectorEmitter.h
+++ b/utils/TableGen/InstrSelectorEmitter.h
@@ -12,6 +12,8 @@
 #include "CodeGenWrappers.h"
 #include <vector>
 #include <map>
+#include <cassert>
+
 class DagInit;
 class Init;
 class InstrSelectorEmitter;